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Time-lapse video: What could be the identity of this trailing light in the sky above Yellowknife, northern Canada? A passing airplane, high altitude clouds, and rays of aurora are also captured in the sky. The mystery light appeared in the sky between 01:31 and 1:45 local summer time (GMT -6 hours) of Sep. 23, 2011. See this still image of the scene with more details. Kwon, O Chul - AstroKorea.com/kwon572